Replace more ObserverList with base::ObserverList.

chromeos/dbus/fake_session_manager_client.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_DBUS_FAKE_SESSION_MANAGER_CLIENT_H_
 #define CHROMEOS_DBUS_FAKE_SESSION_MANAGER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 84 matching lines @@
 
   // Returns how many times LockScreenDismissed() was called.
   int notify_lock_screen_dismissed_call_count() const {
     return notify_lock_screen_dismissed_call_count_;
   }
 
  private:
   std::string device_policy_;
   std::map<std::string, std::string> user_policies_;
   std::map<std::string, std::string> device_local_account_policy_;
-  ObserverList<Observer> observers_;
+  base::ObserverList<Observer> observers_;
   SessionManagerClient::ActiveSessionsMap user_sessions_;
   std::vector<std::string> server_backed_state_keys_;
 
   int start_device_wipe_call_count_;
   int notify_lock_screen_shown_call_count_;
   int notify_lock_screen_dismissed_call_count_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeSessionManagerClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_FAKE_SESSION_MANAGER_CLIENT_H_